Well, our noob thinking was that it would get the round in place for the slide quicker and more positive engagement of the slide release. I not am having problems with stock springs, but just a "value added" thing. Thanks for the replies.
It sounds reasonable to me. Maybe not necessary per se, since you aren't having any failures. But if the slide is moving faster, it stands to reason that to keep the gun in time, you would want to increase the mag spring weight to prevent ftf's.
Although, I have run some pretty light recoil springs and never had any problems with the stock mags. But if it makes you feel better, and you've got some money burning a hole in your pocket, might be worth a try.